Hash 生成器
生成 SHA-1、SHA-256、SHA-384、SHA-512 哈希值
算法说明
SHA-1: 160 位哈希，仅限旧系统使用（不抗碰撞）
SHA-256: 256 位哈希，广泛用于完整性验证和区块链
SHA-384: 384 位哈希，SHA-512 的截短版本
SHA-512: 512 位哈希，SHA-2 系列中最强
使用方法
粘贴或输入内容
在输入区域输入您的文字、代码或数据。
选择选项
选取要应用的转换方式或格式。
复制结果
一键将输出结果复制到剪贴板。
为什么使用此工具
100% 免费
没有隐藏费用，没有付费等级——所有功能完全免费。
无需安装
完全在浏览器中运行。无需下载或安装任何软件。
隐私且安全
您的数据永远不会离开您的设备。不会上传至任何服务器。
支持移动设备
完全响应式设计——在手机、平板或桌面电脑上均可使用。
Cryptographic Hash Functions: MD5, SHA-1, SHA-256, and Beyond
Key Takeaways
- Hash functions produce fixed-length fingerprints of data, enabling integrity verification, password storage, and digital signatures.
- MD5 and SHA-1 are considered broken for security purposes — use SHA-256 or SHA-3 for any security-sensitive application.
- All hash computation happens in your browser using the Web Crypto API — your data never leaves your device.
Cryptographic hash functions are one-way transformations that convert any input into a fixed-size output (the hash or digest). They are fundamental to modern computing — from verifying file integrity and storing passwords to powering blockchain technology. Understanding which algorithm to use and when is critical for building secure applications.
SHA-256 produces a 256-bit hash — the probability of two different inputs producing the same hash is roughly 1 in 10^77.
Collision Resistance
Key Concepts
One-Way Property
Hash functions are designed to be computationally infeasible to reverse. Given a hash output, you cannot determine the original input. This property makes them ideal for password storage.
Collision Resistance
A strong hash function makes it extremely difficult to find two different inputs that produce the same hash. MD5 and SHA-1 have known collision attacks, which is why SHA-256 is now the standard.
Avalanche Effect
Changing even a single bit of input produces a completely different hash output. This property ensures that similar inputs cannot be detected by comparing their hashes.
Algorithm Comparison
MD5 (128-bit) is fast but broken. SHA-1 (160-bit) is deprecated. SHA-256 (256-bit) is the current standard. SHA-3 (variable) offers an alternative design. Choose based on your security requirements.
Pro Tips
Never use plain hashes for password storage — use bcrypt, scrypt, or Argon2 which add salt and computational cost.
Use SHA-256 file hashes to verify download integrity — compare with the hash published by the software vendor.
MD5 is still acceptable for non-security uses like cache keys, deduplication checks, and checksums where collision attacks are not a concern.
The Web Crypto API (SubtleCrypto.digest) provides hardware-accelerated hashing in modern browsers — much faster than JavaScript implementations.
All hash generation is performed entirely in your browser using the Web Crypto API. Your input data is never transmitted to any server, making this tool safe for hashing sensitive content.